Ergonomic chair



FIG. 1 is a front perspective view of an ergonomic chair, showing my design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a left side elevation view thereof.

FIG. 5 is a right side elevation view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines illustrate portions of the ergonomic chair that form no part of the claimed design. 

CLAIM The ornamental design for an ergonomic chair, as shown and described. 